int  a =  290 ;
 System.out.println(Integer.toString(a,  2 )); 

    /**
     * Returns a string representation of the integer argument as an
     * unsigned integer in base 2.
     * <p>
     * The unsigned integer value is the argument plus 2<sup>32</sup>
     * if the argument is negative; otherwise it is equal to the
     * argument.  This value is converted to a string of ASCII digits
     * in binary (base 2) with no extra leading <code>0</code>s.
     * If the unsigned magnitude is zero, it is represented by a
     * single zero character <code>'0'</code>
     * (<code>'0'</code>); otherwise, the first character of
     * the representation of the unsigned magnitude will not be the
     * zero character. The characters <code>'0'</code>
     * (<code>'0'</code>) and <code>'1'</code>
     * (<code>'1'</code>) are used as binary digits.
     *
     * @param   i   an integer to be converted to a string.
     * @return  the string representation of the unsigned integer value
     *          represented by the argument in binary (base 2).
     * @since   JDK1.0.2
     */
     public   static  String toBinaryString( int  i) {
	 return  toUnsignedString(i,  1 );
    }